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The original was posted on /r/todayilearned by /u/gullydon on 2025-07-04 06:30:36+00:00.

Original Title: TIL A 2023 study found that Chinstrap penguins take over 10,000 micro-naps a day, each lasting 4 seconds. When combined, that totals more than 11 hours of sleep daily. They are also generally considered to be the most aggressive and ill-tempered species of penguin.[